You need to pick your brush prior to running stroke path. Plenty of circular brushes comes with GIMP. Can also just make your own using the elipse too and fill with color and copy it to clipboard but that's a whole different topic. Anyway, I picked this brush.
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You already guessed the elipse tool for the selection. You can go into the the settings dialog Window to control the size.
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To stroke, you need to play with the spacing setting in the brush dialog Window (see above for that; trial and error unfortunately). Hope that helps you Micki.
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